Re: t-test question

*To*: mathgroup at smc.vnet.net*Subject*: [mg64160] Re: t-test question*From*: "Ray Koopman" <koopman at sfu.ca>*Date*: Fri, 3 Feb 2006 01:03:47 -0500 (EST)*References*: <dru719$a0n$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Csukas Attila wrote: > Dear all, > > I have found an equation for comparing two means. > > Ue = (na - 1)*Ua + (nb - 1)Ub/na + nb - 2 This is for the pooled > value of distribution and > > t0 = |xa-xb|/ Root Ue*(1/na+1/nb) This is for the t value. > > Sample values > na=342 > nb=170 > Ua=6.39 > Ub=6.07 > xa=177.19 > xb=170.37 > > Does anybody have idea how this works in Mathematica? > I am not familiar with Mathematica syntax but interested how would this > work... > > Any help and idea appreciated. > > Attila In[1]:= na = 342 nb = 170 Ua = 6.39 Ub = 6.07 xa = 177.19 xb = 170.37 Ue = ((na - 1)*Ua + (nb - 1)Ub)/(na + nb - 2) t0 = Abs[xa-xb]/Sqrt[Ue*(1/na+1/nb)] Out[1]= 342 Out[2]= 170 Out[3]= 6.39 Out[4]= 6.07 Out[5]= 177.19 Out[6]= 170.37 Out[7]= 6.28396 Out[8]= 28.9915